test button to test slack integration

[darkdarkdragon]

Description

Add test button to test slack integration

Checklist

• linter status: 100% pass
• changes don't break existing behavior
• commit message follows commit guidelines

Affected core subsystem(s)

ui

Testing

manually tested

Refers/Fixes

Fixes #1004

[codecov]

Codecov Report

Merging #1070 into master will decrease coverage by 0.12%.
The diff coverage is 8%.

@@            Coverage Diff            @@
##           master   #1070      +/-   ##
=========================================
- Coverage   32.02%   31.9%   -0.13%     
=========================================
  Files         105     105              
  Lines        7247    7269      +22     
  Branches      941     947       +6     
=========================================
- Hits         2321    2319       -2     
- Misses       4818    4842      +24     
  Partials      108     108

Impacted Files	Coverage Δ
app/marketing/views.py	15.52% <8%> (-1.23%)	⬇️
app/app/settings.py	80.79% <0%> (-1.99%)	⬇️

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[mbeacom]

@darkdarkdragon Thanks for the contribution!
Overall, lgtm.

I am going to make a few adjustments to this post-merge to DRY it up a bit and move some of the business logic out of the view.

Thanks again!